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Calculating a \$ "Swing", (eg., scenario "A" vs "B" \$ difference)

I'm asking for a formula to calculate the \$ difference (swing) between different \$ scenarios.

A specific example is what is the swing between not renting a house (-\$700/month) vs renting monthly (+\$1000/month) for a swing of \$1700.  Other examples exist such as not renting (-\$700) and renting on Airbnb (+200) for a \$900 swing, or partial renting (\$-700 vs -\$100) for a \$600 swing.

General examples of this are the difference between:

two negative numbers (eg., -\$300 vs -\$1000) = \$700 swing

Mixed positive and negative (e.g., -\$300 vs +\$1000)= \$1300 swing

two positive numbers (e.g., +\$300 vs +1000)= \$700 swing

Thank you!!
0
John H
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1 Solution

Finance AnalystCommented:
For those three examples a simple deduction gets the quoted results:

A             B            C
-300         -1000      =B1-A1     -700
-300          1000      =B2-A2     1300
300           1000      =B3-A3       700

Thanks
Rob
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General TinkererAuthor Commented:
Simple -  (which kinda shows how poor my math skills are :)

Cheers!
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Finance AnalystCommented:
Basic rule of maths "A number minus a negative gives positive" so Minus -300 is same as plus 300
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General TinkererAuthor Commented:
Copy that.  I think kids these days learn that by 7th grade :)
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